The SAVAKU, or BOAT-BILL (_Cancroma cochlearia_), has a compact body, a comparatively short strong neck, thick flat-crowned head, and an extremely broad bill, which is longer than the head, much depressed and dilated towards its middle. The culmen is prominently keeled with a deep lateral groove, extending to the tip, which is acutely hooked; the nostrils are placed in the lateral groove on the surface of the bill, their openings are longitudinal, and partly covered by a membrane. The moderate-sized, powerful wings have the fourth quill longer than the rest; the short broad tail is composed of twelve feathers, and the long slender legs are clothed almost to the knee; the soft streaming feathers upon the nape form a plume; the cheek-stripes and a portion of the throat are bare; the broad cheeks and fore part of the neck are white; the lower neck and breast yellowish white; the back is light grey; the back of the neck and belly are reddish brown, with black sides; the quills and tail-feathers are whitish grey; the brown eye is edged with grey, and the brown beak has a yellow margin to the lower mandible; the foot is of a yellowish shade. The male of this species is twenty-two inches long and thirty-eight across; the wing measures eleven inches and a half, and the tail four inches and a half; the female is somewhat smaller than her mate; the plumage of the young is at first entirely reddish brown, with the back of a deeper colour than the under side. This bird is an inhabitant of Brazil, where it frequents the reed or bush covered banks of streams, and lives either solitary, or, during the breeding season, in pairs, keeping principally amongst the thickest trees or bushes, and hopping nimbly from branch to branch. Water insects of all kinds probably afford it the principal means of subsistence, although the stomachs of specimens examined by the Prince von Wied only contained worms. We are unacquainted with the voice and other habits of this strange bird, except that it occasionally produces a clapping sound with its bill, after the manner of a Stork. The eggs of the Savaku are oval in shape, pure white, and lustreless. THE HAMMER-HEAD, OR SHADOW-BIRD.